@SynopsisTantilize
Well Im not entirely sure what will happen using a lemmy account byt try - Grab your Lemmy account and login a client like #Fedilab - Find a Mastodon user and comment or follow them and watch what happens.

You can’t follow Mastodon users from Lemmy. You can view their profiles, but messaging them doesn’t seem to work (I receive no notification of it on Mastodon) and it only shows you the comments they made on Lemmy rather than all their posts. You can @ mention Mastodon users in Lemmy posts and comments, and that works. And they can follow Lemmy communities and their replies show up in the post comments.